koblenz, germany - 09 17 2024: balduinbrücke, stone arches bridge

landmark arch architecture bridge monument building memorial waterway wall facade ruins monastery fortification estate tourism chapel koblenz germany 2024: koblenz-lützel city rhine marks north mittelrheintal unesco world heritage site mosel river ends town right old lützel balduinbrücke stone arches bridge building deterioration connection crossing valley town center historic history medieval architecture heritage culture